+ // Convert the DTS to DTB
+ int dts_pipe[2];
+ pid_t dts_pid;
+
+ if (pipe(dts_pipe) != 0 || (dts_pid = fork()) < 0) {
+ std::cerr << "Failed to fork dts child: " << strerror(errno) << std::endl;
+ exit(1);
+ }
+
+ // Child process to output dts
+ if (dts_pid == 0) {
+ close(dts_pipe[0]);
+ int step, len = dts.length();
+ const char *buf = dts.c_str();
+ for (int done = 0; done < len; done += step) {
+ step = write(dts_pipe[1], buf+done, len-done);
+ if (step == -1) {
+ std::cerr << "Failed to write dts: " << strerror(errno) << std::endl;
+ exit(1);
+ }
+ }
+ close(dts_pipe[1]);
+ exit(0);
+ }
+
+ pid_t dtb_pid;
+ int dtb_pipe[2];
+ if (pipe(dtb_pipe) != 0 || (dtb_pid = fork()) < 0) {
+ std::cerr << "Failed to fork dtb child: " << strerror(errno) << std::endl;
+ exit(1);
+ }
+
+ // Child process to output dtb
+ if (dtb_pid == 0) {
+ dup2(dts_pipe[0], 0);
+ dup2(dtb_pipe[1], 1);
+ close(dts_pipe[0]);
+ close(dts_pipe[1]);
+ close(dtb_pipe[0]);
+ close(dtb_pipe[1]);
+ execl(DTC, DTC, "-O", "dtb", 0);
+ std::cerr << "Failed to run " DTC ": " << strerror(errno) << std::endl;
+ exit(1);
+ }
+
+ close(dts_pipe[1]);
+ close(dts_pipe[0]);
+ close(dtb_pipe[1]);
+
+ // Read-out dtb
+ std::stringstream dtb;
+
+ int got;
+ char buf[4096];
+ while ((got = read(dtb_pipe[0], buf, sizeof(buf))) > 0) {
+ dtb.write(buf, got);
+ }
+ if (got == -1) {
+ std::cerr << "Failed to read dtb: " << strerror(errno) << std::endl;
+ exit(1);
+ }
+ close(dtb_pipe[0]);
+
+ // Reap children
+ int status;
+ waitpid(dts_pid, &status, 0);
+ if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
+ std::cerr << "Child dts process failed" << std::endl;
+ exit(1);
+ }
+ waitpid(dtb_pid, &status, 0);
+ if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
+ std::cerr << "Child dtb process failed" << std::endl;
+ exit(1);
+ }
+
+ return dtb.str();
+}
+
+void sim_t::make_dtb()
+{
+ const int reset_vec_size = 8;
+
+ start_pc = start_pc == reg_t(-1) ? get_entry_point() : start_pc;
+
+ uint32_t reset_vec[reset_vec_size] = {
+ 0x297, // auipc t0,0x0
+ 0x28593 + (reset_vec_size * 4 << 20), // addi a1, t0, &dtb
+ 0xf1402573, // csrr a0, mhartid
+ get_core(0)->xlen == 32 ?
+ 0x0182a283u : // lw t0,24(t0)
+ 0x0182b283u, // ld t0,24(t0)
+ 0x28067, // jr t0
+ 0,
+ (uint32_t) (start_pc & 0xffffffff),
+ (uint32_t) (start_pc >> 32)
+ };
+
+ std::vector<char> rom((char*)reset_vec, (char*)reset_vec + sizeof(reset_vec));